Usually small glass article made by craftsman outside normal working hours, as a gift or for sale, or lampworked article by an itinerant glassblower. Often of no functional use. (Known as a "whimsy" in the USA)

Frosted glass

Glass given a semi-opaque frosted surface by dipping in, or exposing to the fumes of, a mixture of hydrofluoric acid and ammonia

A type of decanter, based on a much older German or Scandinavian design, where the four corners of the square-sectioned body are pinched together down the side, so that the lower reservoir is effectively connected to the upper by five 'tubes'. The name is believed to derive either from the German 'Kuttering' ('gurgling' - from the noise heard when liquid is poured out), or the Latin 'Gutta' ('a drop of liquid' - as the design derives from a Roman 'dropper' bottle for dispensing medicines). Also called a 'cluck-cluck'. See decanters & drinking-glasses for an illustration